We are really lucky. Live in a tiny street of just 10 properties where everyone knows each other by name, we nearly all contribute to keeping our street clean and tidy, keep an eye out for anything unusual, suspicious, tell each other if anyone gets burgled, take in parcels for each other, even share house keys if anyone goes on a long break, jump start each other’s cars, clear the snow, fetch shopping etc for anyone who is ill, check everyone is ok if there’s a power cut. All sorts of kind, well communicated, shared problem solving. We don’t live in each other’s houses, don’t pop round every five minutes, but there might be an occasion meal shared, a BBQ. Anyone new who moves in gets a quiet hello, a few names, then a gentle offer of any help if required. Privacy respected if this is preferred. Any issues with local council, we fight as a team, and it gets so much more achieved.
It’s not rocket science, but little neighbourly niggles don’t become major issues, everyone gets on, there’s lots of respect, and it makes for a much nicer environment. My Mum has similar adjacent neighbours. In the North by the way.